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(1/2) + (2/1) + (3/1) = (1+4+6)/2 = 11/2
(11/2)x = 55
11x = (55)*(2)
11x = 110
x = 110/11
x = 10
Comprobación:
(10/2) + 2(10) + 3(10) = 55
5 + 20 + 30 = 55
55 = 55